This study developed a simple and rapid NIRS method for
simultaneous determination of alcohol strength and titratable
acidity content in apple wine. The NIRS models showed a good
agreement between calibration and predication data with adequate
high correlation of determination of R2 and relatively low predictive
errors of RMSEP. The results demonstrated that NIR spectroscopy
can used as an alternative method to rapidly analyze alcohol
strength and titratable acidity, with a very high applicability for
monitoring apple wine fermentation process in order to improve
the quality of apple wine.